Flight planning in the |Embraer Phenom 500

Having d/loaded and installed this lovely aircraft, followed by the 'Nav. Pack; add on, I am finding it impossible to create  either a "Direct to" or a Flight Plan using the G1000 or  the GCU 477 units.

i believe the first input needs to be the ICAO code for my start airfield. However, when I use the inner section of the FMS control wheel and turn it clockwise, despite the input area  - lying immediately below the Comms radio settings -  starting to flash willingly, there's no way that I can input any code. It just flashes away, blissfully indifferent.

Anything I might have missed ?

That sound problem I had earlier has been solved with a bit of finger extraction.

Thanks for your helpful suggestions.